Deformation and orientation during shear and elongation of a polycarbonate/carbon nanotubes composite in the melt |
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Authors: | U A Handge P Pötschke |
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Institution: | (1) Department of Materials, Institute of Polymers, ETH Zürich, Wolfgang-Pauli-Strasse 10, HCI H 529, 8093 Zürich, Switzerland;(2) Department of Polymer Reactions and Blends, Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany |
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Abstract: | In this study, we focused on the elongational rheology and the morphology of an electrically conductive polycarbonate/multiwalled
carbon nanotubes (2 wt%) composite in the melt. In shear and melt elongation, the influence of the carbon nanotubes was large
when the externally applied stress was small. Consequently, the elastic interactions resulting from the carbon nanotubes dominated
in the low frequency range of the shear oscillations. The elongational viscosity of the composite was only moderately influenced
by the addition of 2 wt% carbon nanotubes. Transmission electron microscopy investigations of the stretched composite showed
that isolated carbon nanotubes were oriented in elongation. In recovery after melt elongation, the recovered stretch of the
composite was much smaller than the recovered stretch of pure polycarbonate. This effect is caused by the carbon nanotubes
network, which prohibited large extensions of the macromolecules and led to a yield stress of the composite. |
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Keywords: | Extensional rheology Nanocomposites Carbon nanotubes Morphology |
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